Heritage archive

Sun-and-planet gear on a Boulton & Watt engine of 1788

June 2011 · Science Museum, London

Close view of an old timber and iron beam engine: a toothed ‘planet’ wheel fixed to the end of the connecting rod meshes with a toothed ‘sun’ wheel on the flywheel shaft. — Geni, June 2011. Wikimedia Commons · CC BY-SA 4.0 · Select the picture to zoom and pan.

The sun-and-planet gear at work on a Boulton & Watt engine of 1788 in the Science Museum, London. Boulton & Watt used it for their rotative engines while the crank patent lasted.

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